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Passive Seismic Emission Tomography Applied to Mapping of Geothermal Permeability

机译：被动地震辐射断层扫描应用于地热渗透性的绘图

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The utility of passive seismic emission tomography for mapping geothermal permeability has been tested at two locations in northern Nevada, San Emidio and Crescent Valley. The San Emidio study area overlaps a geothermal field in production since 1987 and also a new, hotter resource recently drilled to the south of the production field. In contrast, the subsurface at the Crescent Valley study area is poorly constrained by drilling with geothermal potential mainly indicated by geothermometry of hot spring discharges, shallow, high heat flow, and reports of blown out mineral exploration wells. Newly acquired magnetotelluric data and passive seismic data collected with tightly spaced geophone arrays are combined with historic drilling, active seismic, and potential fields data to generate 3-D permeability maps. A cooperative inversion methodology has been developed using active seismic, magnetotelluric, and gravity data in order to produce more robust velocity models for passive seismic data processing without requiring expensive 3-D active seismic surveys. The cooperative inversion estimates velocities from other geophysical data where no prior seismic velocity information is available. A robust 3-D permeability map can be created using magnetotelluric and dense passive seismic datasets when they are combined with drilling and potential fields datasets that help constrain the structural and geological controls on geothermal permeability. Cooperative inversion of seismic and magnetotelluric datasets provides more robust and location-specific velocity models that optimize processing and interpretation of passive seismic data while also increasing the utility of magnetotelluric data for identifying structures that control geothermal permeability. Ongoing work will compare and contrast the passive seismic emission tomography results from simple versus refined velocity models.
机译：在内华达州北部的两个地区进行了用于映射地热渗透性的被动地震释放断层扫描的效用。自1987年以来，SAN Emidio研究区重叠了生产中的地热场地，也与最近钻到了生产领域的南部的新的更热的资源。相比之下，新月形谷研究区的地下通过钻孔，地热势钻孔受到严重的限制，主要由热弹簧排放，浅，高热流和爆炸矿物勘探井的报道表示。使用紧密间隔的地震仪阵列收集的新收购的磁识别数据和被动地震数据与历史钻井，有源地震和潜在的场数据相结合，以产生3-D渗透性图。使用主动地震，磁音和重力数据开发了合作反演方法，以便为被动地震数据处理产生更强大的速度模型，而不需要昂贵的3-D主动地震调查。协同反演估计来自其他地球物理数据的速度，其中没有现有的地震速度信息。当它们与钻孔和潜在场数据集结合时，可以使用Magnetelluric和Cented Dirsive地震数据集来创建强大的3-D渗透率图，这些数据集有助于限制地热渗透性的结构和地质控制。地震和电磁数据集的协作反转提供更健壮和位置特定的速度模式，被动地震数据的优化处理和解释，同时也增加大地电磁数据的效用，用于识别结构，其控制地热导率。正在进行的工作将比较和对比简单与精制速度模型的被动地震释放断层扫描结果。

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